Förster distance values are calculated using the method presented in Wu & Brand (1994). Additionally, Förster distance multiplied by the quantum yield of the acceptor is calculated as an indication of dynamic range expected in ratiometric FRET using the sensitized emission method. Results are presented in a sortable tabular format, with a search field for ease of locating specific proteins. The overlap integral (between donor emission and acceptor absorbance) is highlighted in the spectra image for the currently selected FRET pair, and values for refractive index and orientation factor can be changed by the user.